Pipe covering



Dec. 15, 192s.

A. L.. BYs'rRoM w PIPE COVERING Filed April l. 19,24

m .n .NN @N Nw @Nvu awo: ne u I Patented 15, i225,

Utili? SATS mettra PTET Fi.

PPE COVERNG.

Application filed April 1,

To @ZZ ywhom it may concern.'

vlie it known that l, ALBERT L. BYsTRoM, a citizen of the United States,residing at Tower, in the county of St. Louis and State of Minnesota,have invented a new and useful Pipe Covering, of which the following isa specilication.

This invention relates to a pipe covering for `use in connection withsteam pipes and the like7 one of the objects being to provide a coveringformed of units that can be assembled readily and operate to main tain apartial vacuum around the steam pipe, and to properlyinsulate the jointsof the covering so as to maintain the partial vacuum unimpaired.

A further object is to provide a covering the outer casing of which iscapable of expansion and contraction under variations of temperature.

Vith the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing` Afrom the spirit of theinvention.

In the accompanying drawings the pre ferred forms of the invention havebeen shown.

In said drawings Figure 1 is a longitudinal section through one form ofpipe covering embodying the present improvements.

Fig. 2 is a section through another form.

Referring in the ligures by el'iaracters of reference 1 designates theinner tubular member of the covering each end of which is surrounded bya collar 2 fastened to the member by rivets or the like and providedwith an outstanding annular flange 3. Secured to the tubular memberclose to each of the collars 2 is a ring 4 having an outstanding annularportion 5 the outer edge of which is inturned to provide a gripping.fiange (5 extending around the member 1 and concentric with and spacedfrom the inner portion of the ring t.

Flange G is adapted to interfit or interlock with a flange 7 extendinginwardly from a ring 8 concentric with the member 1, this flangehavingits free edge portion bent 1924. Serial No. 703,479.

or turned back so as to interlock with flange 5 as shown. A sealingstrip 9 of cork or other suitable material is gripped between theinterlocking annular portions 5 and 7 so as to prevent leakage of airbetween them.

,Extending into and secured to the ring S is a flange 10 provided at thebase of a frusto-conieal ring 11 extending around member 1 but spacedfrom it.

rlhe structure hereinbefore described is provided at each end of eachtubular memthe two ends project into and are secured to the ends of acorrugated outer tubular member 12 substantially concentric withmember 1. Thus an annular' space is provided between the members 1 and12 and between the interlocking members at the two ends of thestructure, this space providing a partial vacuum for the purpose ofretarding the conduction of heat between the members 1 and 12.

The complete structure thus far described constitutes one complete unitof the pipe covering. lVhen two or more units are to be assembled theyare placed end to end with a sealing gasket 13 between them and betweenthe flanges 3. The units are then fastened together by means of bolts14: or the like extending through the flanges 3. The space surroundingthe collars 2 and their Hanges 3 and located between the interlockingportions 5 and 7 is filled with asbestos or other suitable insulatingpacking indicated generally at 15. A sleeve 16 is then placed inposition around the adjoining rings 8 of the two units. This sleeve hasits end portions provided with annulailianges 17 extending outwardlytherefrom and provided with oiset portions 1S and 1S) respectively.rlhese oifset portions are adapted to project into the inturned ends 2Oof an outer sleeve 21 corrugated as shown at 22 and spaced from thesleeve 1G so as to provide a partial vacuum between the sleeves.

1t is to be understood that the pipes to be covered extend through thetubular members 1 and air is to be exhausted from these tubular membersso as to leave a partial vacuum. After the covering has been assembledwith the pipes the loss of heat by radiation will be practicallyeliminated and a great saving of fuel and heat can thus be effected.

Instead. of constructing the covering as illustrated in Fig. l thesimplified form shown in Fig. 2 may be employed. This includes an innertubular member 23 having laterally oliset annular flanges 24 and 25 atits respective ends, the free end portion ot the flange 24 being bentback as shown at 26 so as to lap and interlock With one end et an outertubular member 27. This outer member has annular corrugations 28 and theother end oit the outer member is inturned as at 25) so to interlockwith the offset flange The external diameter of this end ot the coveringshown in Fig. 2 is substantially equal to the internal diameter of theeountersink 30 l'irn'ied by the offset flange Q4. Thus it will be seenthat when tivo or more ot these covering units are assembled end tol endthe countersink 30 ot' each unit can receive the adjoining end ot thenext unit. Air is to be withdrawn from the space between the. members 2Sand 27 and the partial vacuum thus established Will practically preventconduction of heat rays from one member to the` other. In this structureas Well as in the form shown in Fig. l the corrugated members permittree expansion and contraction Without injurious distortion Whensubjected to climatic changes. It Will be obvious that a partial vacuumcan be established at the desired points in the covering in any knownWay such as by the use of valved outlets to which air exhausting pumpscan be applied. This method of creating a partial vacuum is so wellknown that a detailed description or illustration thereof is not deemednecessary.

That is claimed is A pipe covering including similar units eachcomprising an inner tubular pipe receiving member, annular outstandingportions at the ends ot the member7 an outer tubular member providedwith annular corrugations, there being a partial vacuum lietween saidmembers, and means at the ends ot' the outer tubular member interlockingwith the annular outstanding portions to seal the space between themembers, and means i'or sealing the connection between the units, `saidlast mentioned means including connected inner and outer sleeves iittedupon said ends and having a partial vacuum between them, and aninsulating packing surrounded by the inner sleeve.

In testimony that I claim the foregoing as my own., I have heretoaiiixed my signature.

ALBERT LEONARD BYSTROM.

